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Question

The spring is compressed by a distance a and released. The block again comes to rest when the spring is elongated by a distance b. During this process:
1152250_1b24fa6d228b48adba061488935caf09.jpg

A
work done by the spring on the block = 12k(ab)2
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B
work done by the spring on the block = 12k(a2+b2)
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C
co-efficient of friction = k(ab)2mg
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D
co-efficient of friction = k(a+b)2mg
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Solution

The correct options are
A work done by the spring on the block = 12k(ab)2
C co-efficient of friction = k(ab)2mg
2010335_1152250_ans_afdede596a65458a987e6de16584fdb6.jpg

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